Leadership is a big deal with this army so that is the reason I went with Skarsnik because of his higher than usual leadership for a Night Goblin, a big 8. So my other games I kept my goblin units around him and put my spider riders in front so they can flee from charges.

I'd never take more than 2 units of cavalry and stick them on the flank. If you put them anywhere near your main line I (as an example opponent) would shoot all my shots at them, wipe them out and cause panic for the Gobbo units.